Effects of γ-radiation on electrical properties of natural quartz

Study of temperature-frequency (20-700 deg C; 0.5-10 kHz) ratios of dielectric characteristics (permittivity and dielectric losses) of natural quartz crystals, irradiated by γ-quanta of 60Co in the dose range of 5x105-2x109 P. It is established that maximum of losses and the start of the high growth of permittivitity are shifted due to irradiation in the region of higher temperatures. The more is the radiation dose the more is the shift. It is found that unlike the optical properties radiation-induced variation of permittivity and dielectric losses do not have a saturation withing whole dose range. A series of subsequent annealings of samples at elevating temperatures shifts the peak of dielectric losses and the start of permittivity growth in the direction reverse to temperature, region but even annealing at 720 deg C does not return a sample into initial state